21100101021111 has 16 divisors (see below), whose sum is σ = 32936743058688. Its totient is φ = 11763122520000.

The previous prime is 21100101021067. The next prime is 21100101021143. The reversal of 21100101021111 is 11112010100112.

It is not a de Polignac number, because 21100101021111 - 2¹⁰ = 21100101020087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100101022111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12253251765 + ... + 12253253486.

It is an arithmetic number, because the mean of its divisors is an integer number (2058546441168).

Almost surely, 2^{21100101021111} is an apocalyptic number.

21100101021111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21100101021111 is a deficient number, since it is larger than the sum of its proper divisors (11836642037577).

21100101021111 is a wasteful number, since it uses less digits than its factorization.

21100101021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24506505302.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21100101021111 its reverse (11112010100112), we get a palindrome (32212111121223).

The spelling of 21100101021111 in words is "twenty-one trillion, one hundred billion, one hundred one million, twenty-one thousand, one hundred eleven".